Why We Yawn - And Why Yawning Is So Contagious

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Your grandmother says it's because you watch too much TV. Your teacher thinks it's because you're bored. And that creepy guy on the bus just slapped you with a phonebook in an attempt to exorcise the devil living in your molars. All because you're yawning.   There's got to be a better explanation, right?
Scientists haven't nailed down the exact cause of our 240,000 lifetime yawns yet, but there's good support for the yawn as a temperature regulator. more...